Reduction mill



Oct 10, 1944.

w. B. THURMAN ETAL 2,360,086

REDUCTION MILL Filed Jan. 19, 1943 2 Sheets-Sheet 1 Q mV 93 Q Q Q i} 9}INVENTORS 50.5. T]: urman BY E. H,GZynn ATTORN EYS 6 1944- w. B. THURMANETAL 2,360,086

REDUCTION MILL Filed Jan. l9, 1943 2 Sheets-Sheet 2 INVENTORS 50.5, Tharms):- BY E. H. Glyn r2 ATTORNEYS Patented Oct. 10, 1944 UNITED STATESPATENTOFFICE 2,360,086 REDUCTION MILL William B. Thurman and Edwin A.Glynn; Lodi, Calif., assignors to Super Mold Corporation of California,Lodi, Calif.

Application January 19, 1943, Serial No. 472,866

2 Claims.

This invention relates in general to an improved reduction mill, and inparticular is directed to an impact mill for reducing ore ma desiredscreen size for subsequent processing and the recovery of preciousmetals therefrom.

One of the objects of the present invention is to provide an orereduction mill which includesan assembly of axially alined rotary impactunits mounted on a driven vertical shaft, and a cylindrical housingsurrounding said shaft and assembly in concentric, adjacent butclearance relation to the latter; said housing being faced on theinterior with ore disintegrating plates, and additionally said housingis formed with a relatively large side opening door whereby parts of themill within said housing may be removed, repaired, or replaced withrelative ease and without necessity of disassembling the mill.

a reduction mill which includes rotary impact units of uniqueconstruction; each of s'aid'units comprising a hub, legs radiating fromsaid hub, and removable impact shoes mounted on the outer ends of saidlegs.

A further object is to provide rotary impact units as in the precedingparagraph in which the impact shoes are elongated and extend generallytransversely of the direction of travel or rotary movement; said shoesbeing doubleended and reversibly mounted so that when the initiallyouter ends of said shoes become worn, the shoes may be reversed and theother end thereof disposed outermost for subsequent operation of themill. I

An additional object is to provide a reduction mill which includes anovel adjustable mount-.

' as will fully appear by a perusal of the following specification andclaims.

In the drawings similar characters of reference indicate correspondingparts in the several views:

Figure 1 is a side elevation, partly in section, of the'improvedreduction mill.

Another object of the invention is to provide said mounting beingarranged to posie Figure 2 is a plan view of the mill with the top ofthe housing partially broken away.

Referring now more particularly to the characters of reference on thedrawings, the numeral l indicates a cylindrical housing disposed withits axis vertical, said housing including a circular top 2. The housingI may be rigidly supported in any suitable manner.

The housing I is formed at the side with a door opening 3 which issubstantially halfcircle in circumferential extent and at the top andbottom edges terminates adjacent but short of corresponding ends of thehousing. The portion of the housing within and normally closing saidopening is a separate, circumferentially arcuate door 4 which is hingedto a fixed portion of the housing, as at 5, for horizontal swingingmovement between open and closed positions; the door when closed beingsecured in said position by a releasable locking bolt assembly,indicated at 6, which connects between the free end of the door andadjacent portion of the housing. V

The housing at the top and on the inside is fitted with a rigid ring Iwhose inner surface slopes inwardly and downwardly as a deflector; saidring depending below the top edge of the door opening 3 and forming astop for the upper portion of the door 4. A seal 8 is secured on saiddepending portion of the ring and against which seal the door engages.

The. bottom. of the housing is. open and is fitted with an annular,downwardly and inwardly sloping chute 9 which includes an attachmentflange l0 secured withinthe housing adjacent its lower end. .A door stopI l is formed integral with and projects upwardly from the flange H1 insymmetrical relation to door 4; said stop including a seal l2againstwhich the lower portion of said door engages.

At vertically spaced points between the ring I and the annular chute 9the housing is fitted with horizontal rings [3, each of which includesan annular, downwardly and inwardly sloping skirt or ore deflector l4,said deflectors being relatively short radially of the mill. The rings Mare attached to the housing by, means of bolts [5, except the lowermostone of said rings which is attached to the mounting of chute 9 by meansof bolts I6.

Between the rings I3 the housing I is faced with annular oredisintegrating plates ll whose inner surface is deeply corrugated, thecorrugatlons I 8 extending vertically. The disintegrator plates I! areattached to the sides of the housing 1 correct position on foot-.2 6.parent, "the shoe may be attached to the foot .26 i with the tongue 28.seatedin either socket 2-9,

byQbolts l9. J'The portions of the rings l3, de flectors I 4, andcorrugated disintegrator plates l1 which are attached to the door 4 arearcuate sections of said parts separate from the remainder, whereby theyswing out with said door. 7

A vertical shaft disposed centrally in the housing isljournaled at itsupper end in a dustsealed bearing 2| mounted on the top 2 the shaftprojecting upwardly to a termination above said top. At its lower endthe shaft is journaled in a bearing 22 supported by a spider 23 fixedinthe' annularchute 9.' v

In horizontal planes substantially equi-distant between the upper andlower edges of adjacent ore disintegrator plates I1,the shaft is fittedwith corresponding rotary impact units. Each of these units comprises asplit hub 24 clamped on the shaft 20, and a pair of legs 25 radiatingfrom.

saidjhub in opposite directions. At its outer end each leg 25 is formedwith a horizontal impact shoe-supporting foot 26 whichj'hasa'verticalbut horizontalz-elongated face Fysaid face extending said ore.

offset relation to the shaft I; ore as fed through said opening andpassing through the mill be ing deflected onto the rotary impact unitsby deflectors l4 and deflectors 3|. The rotary impact units, the shoesof different ones of which are disposed in circumferentially staggeredrelation, and which shoes substantially span the space betweencorresponding deflectors I4 and 3|, strike the falling. ore, and Withhigh impact drive it against the disintegration plates l1, producing aneifective reduction in screen size of The assembly of rotary impactunits is rotated at relatively high speed by shaft 20, which is drivenin the following manner.

A heavy-duty electric motor 34 is disposed'to one side. of the housing Iwith the drive shaft 1 35 of the motor vertical and rojecting abovethehorizontal plane of top 2.

Rigid brackets '36 project horizontally outwardly from thehouslengthwise generally transversely of the direction 7 of travelgasindicated by the arrow in Fig,- 2, and with the inner end of said footleading the outer endthereof.

A horizontal impact shoe 21 of substantially the between.

ing I in vertically spaced relation and to a termination adjacent themotor 34, said brackets supporting a vertical post 31' which extendsthere- Split bands 38 clampinglyjengage about the motor at spaced pointsand said bands each include ears 39 which surround the post 31in'relatively turnable relation; said ears being engaged between theouter endeportions of the same length as thefoot is removably andreversibly secured against thefa'ceof the latter by the followingarrangement. A single tongue 28, ofT shape in cross section, projectsforwardly from the face F of foot 2$ and-extends fromthe to. a pointslightly short ofthe center of said foot. As there is no tongueprojecting from; the radially innermost half of the foot, the inner endradially outermost end of said foot along thesame of tongue 28 forms anabutment A...v Each shoe 4 21 is formed with a pair oflongitudinallyalined.

sockets .29 o'peningto opposite ends of the shoe andseparated'at.adjacentends by a stop S; the

sockets .2 9 being of the same length and formed.

to matchingly and selectively receive the tongue 2B in frictionalengagement- The inner end or abutment A of tongue 2-8 seats againstthecorresponding endof stop 5 when the shoe is in place and limitsinward movement thereof to Thus, as is apand consequently either end ofsaid shoe outermost; centrifugal force holdi'ng the shoe onthe I v-foot. In other words, the :shoe .21 is reversible, V 5 whereby when theinitially outer end :thereof is badly Worn, the shoe may be reversed andthe initially inner end then disposed'out'ermost for continued operationof the mill. As shown, the r shoe 21 is increased in thicknesshorizontally from-the center towards its ends along or ad-' respondingend of the shoe is outermost, This feature is shown at 30; r V L 7'Access to the above described rotary impact 1 units for the purpose ofreversing the shoes 21. or replacing the same is hadthrough the door 4,and can be quickly accomplished with a miniinum of effort. 1 g

Between the rotaryimpact units, and above the bearings 22,, the millincludes frusto-conical deflectors 3| which have splitxhubs 32 securedon the corresponding portion of the vertical shaft 20; the loweredge ofdeflectorstl being spaced some, distanceghorizontally from and disposedin a vertical plane slightly below, the loweredge of the correspondingannular deflectors I4, A feed opening 3.3]is cut inthe top z of thehousing .in

drive, unit 4|.

brackets whereby to prevent of vertical displacement of the motor, whilesupporting said motor for horizontal; adjustment about the post as anaxis. a 1 r r lturnbuckle adjustment link 40 is,pi-votally connected ingenerallytangential relation betw en ;one of the splitband's 38 and anadjacent portion of the housing 1; said link connecting with said bandonthe side opposite the brackets 36, whereby upon adjustment of the linkthe motor is swung in a horizontal plane relativ to the housing. Anendless multiple belt drive unit;-

4I connects the upper ends of the shaft zll'and 35,,fconnecting themotor in drivingrelation to the rotary impact units. a

Adust-proof beltgu'ard and case42 is through an elongated'openingi 43 intheibo'ttoin of case 42 whereby to permitpf unobstructed horizontaladjustment of the motor by means of jacent thesid'e which is Zuppermostwhen the corlink l4, and-for the purpose of imparting the desiredtension onthe drive unit 4|. In order 7 to prevent dust from gainingaccess to. case 42 a disc 44 is fixed on the upper end 'ofthe motor 34.,and an annular seal -45 is secured to said discand slidably engages thebottom of. thelcase,

about'opening 43. A, i 7 From the'foregoin'g description itwill bereadilyseen. that. We have produced sucha 'device' assubstantially-fulfillstheobjectsj-of the inven tion as set forth herein.While this specification sets may be resorted tolas do not form. adeparture from the spirit of the invention; as defined by the appendedclaims. 7

Having thus described our invention, what we desire to secure by claimsas new and useful and Letters Patent is:

.1-. A reduction mill handing :a vertical 111idrical housing, a drivenaxial shaft in said hous ing, 'a-rplurality of rotary impact unitsmounted on the shaft verticallyspaced-relation, [corre-,;. spondingdisintegrator plates mounted in the.

housing in spaced but adjacent, and surrounding.

relation to said rotary impact -un; i ts annular de V mounted on theytop 2 of the housing and surrounds the; The motor shaft 35 projects.

forthzin detail the present and preferred constructionzof the device, istill in practice such deviations from such detail.

flectors mounted in the housing between the disintegrator plates, andother annular deflectors mounted on the shaft between said units; thedeflectors mounted on the housing sloping downwardly and radiallyinwardly, and the deflectors mounted on the shaft sloping downwardly andradially outwardly, the innermost edges of the deflectors on the housingbeing in a plane radially outwardly of the adjacent edges of thedeflectors on the shaft;

2. A reduction mill comprising a vertically disposed cylindricalhousing, a driven axial shaft in said housing, a plurality of rotaryimpact units fixed on the shaft in vertically spaced relation,

annular disintegrator plates mounted in the hous- 15

